I've had every symptom going in my digestive tract. I once had that feeling as though I couldn't swallow. I thought i was a gonner. The doctor told me it was spasm and that i have a sensitive/ irritable digestive system. My speech and language therapy friend said the same. Your digestive tract is one long pipe. Just like you can get spasm in your colon you can in your oesophagus and apparently acid going the wrong way can cause it but also stress. Once I was told that, it soon relaxed and went. Of course, if you have other symptoms alongside, eg food not going down, weight loss, bleeding, you should get checked.